.NET maintains its own table of characters and their corresponding categories, which ensures that a specific version of a .NET implementation running on different platforms returns identical character category information. On all .NET versions and across all OS platforms, character category information is provided by the Unicode Character Database.
The following table lists .NET versions and the versions of the Unicode Standard on which their character categories are based.
| .NET version | Version of the Unicode Standard |
|---|---|
| .NET Framework 1.1 | The Unicode Standard, Version 4.0.0 |
| .NET Framework 2.0 | The Unicode Standard, Version 5.0.0 |
| .NET Framework 3.5 | The Unicode Standard, Version 5.0.0 |
| .NET Framework 4 | The Unicode Standard, Version 5.0.0 |
| .NET Framework 4.5 | The Unicode Standard, Version 6.3.0 |
| .NET Framework 4.5.1 | The Unicode Standard, Version 6.3.0 |
| .NET Framework 4.5.2 | The Unicode Standard, Version 6.3.0 |
| .NET Framework 4.6 | The Unicode Standard, Version 6.3.0 |
| .NET Framework 4.6.1 | The Unicode Standard, Version 6.3.0 |
| .NET Framework 4.6.2 and later versions | The Unicode Standard, Version 8.0.0 |
| .NET Core 2.1 | The Unicode Standard, Version 8.0.0 |
| .NET Core 3.1 | The Unicode Standard, Version 11.0.0 |
| .NET 5 | The Unicode Standard, Version 13.0.0 |
